Adds some util functions in FileUtils.
Log error when loading lua file failed.
Adds some useful methods in FileUtils.
Merge branch 'lua-vm' of https://github.com/dumganhar/cocos2d-x into lua-vm
Feature #4977: Refactor success callback of Downloader, remove thread pool
Feature #4977: Add compressed key parsing for Asset in Manifest
Feature #4977: Add decompress process in AssetsManager
Feature #4977: Add Error decompress in EventListener
Merge branch 'lua-vm' of https://github.com/dumganhar/cocos2d-x into lua-vm
Feature #4977: Add AssetsManager dependencies into CMakeList
Feature #4977: Improve decompress function
Feature #4977: Fix decompress path issue
Merge pull request #49 from pandamicro/lua-vm

Support compressed file in AssetsManager
Merge branch 'lua-vm' of https://github.com/dumganhar/cocos2d-x into lua-vm

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Feature #4977: Add implementation of real progression
Feature #4977: Improve implementation of real progression
Merge pull request #50 from pandamicro/lua-vm

Feature #4977: Complete implementation of real progression